My WordPress livesite says "An error has occurred. Please reload the page and try again" when I try to edit the sidebar widget text of a twentysixteen child theme. I copied the website to localhost and I did not receive the same error message (I could edit the text just fine). The error occurs with the livesite child theme even with only a "functions.php" file and a "style.css" file. I tried disabling all plugins but I received the same error.
The picture below shows me attempting to change the "Directories" name causing error.